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Balance Sheet Components - Inventories, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 42,996 $ 53,273
Work-in-progress 28,313 22,303
Finished goods 33,625 56,900
Inventory, net $ 104,934 $ 132,476